Sonic Unleashed is built on a powerful new “Hedgehog Engine”, which introduces seamless 3D to classic 2D camera transitions, whilst delivering a rich and expansive world with multiple paths to choose from. Under development for three years, the Hedgehog Engine produces a visually rich next generation look and feel with elements of classic Sonic gameplay mechanics. The Hedgehog engine will help re-define the gameplay experience for Sonic fans and newcomers to the franchise alike.

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Sonic Unleashed takes players on an high-speed journey around the globe in a way never before experienced in the world of Sonic. With a new storyline where day and night play drastically different roles, Sonic Unleashed will send Sonic on an unforgettable quest to save a dying world from the maniacal Dr. Eggman. Players find that Dr. Eggman continues on his mission for domination, but this time he's upped the stakes by causing a catastrophic event that breaks apart the world and unleashes a slumbering beast that alters Sonic in unexpected ways.

Sonic Unleashed takes players on an high-speed journey around the globe in a way never before experienced in the world of Sonic. With a new storyline where day and night play drastically different roles, Sonic Unleashed will send Sonic on an unforgettable quest to save a dying world from the maniacal Dr. Eggman. Players find that Dr. Eggman continues on his mission for domination, but this time he's upped the stakes by causing a catastrophic event that breaks apart the world and unleashes a slumbering beast that alters Sonic in unexpected ways.

Sonic Unleashed takes players on an high-speed journey around the globe in a way never before experienced in the world of Sonic. With a new storyline where day and night play drastically different roles, Sonic Unleashed will send Sonic on an unforgettable quest to save a dying world from the maniacal Dr. Eggman. Players find that Dr. Eggman continues on his mission for domination, but this time he's upped the stakes by causing a catastrophic event that breaks apart the world and unleashes a slumbering beast that alters Sonic in unexpected ways.